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| Commodity | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 | 2011 |
| Electrical insulators, of glass | $155,042 | $216,797 | $325,262 | $85,278 | $127,318 | $210,814 | $166,887 |
| Electrical insulators, of ceramics | $249,736 | $485,918 | $267,854 | $584,729 | $283,289 | $348,579 | $316,071 |
| Electrical insulators of any mat. other than glass & ceramics | $5,127,920 | $3,181,937 | $2,368,691 | $1,998,921 | $1,049,356 | $1,087,735 | $1,326,134 |
| Total | $5,532,698 | $3,884,652 | $2,961,807 | $2,668,928 | $1,459,963 | $1,647,128 | $1,809,092 |
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